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From 13c9a9ded3ae744a1e11cbc14e9146d9fa427040 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sat, 7 Oct 2017 00:11:31 +0200
Subject: [PATCH] imap: if a FETCH response has no size, don't call write
callback
CVE-2017-1000257
Reported-by: Brian Carpenter and 0xd34db347
Also detected by OSS-Fuzz: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3586
---
lib/imap.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/lib/imap.c
+++ b/lib/imap.c
@@ -1140,6 +1140,11 @@ static CURLcode imap_state_fetch_resp(st
/* The conversion from curl_off_t to size_t is always fine here */
chunk = (size_t)size;
+ if(!chunk) {
+ /* no size, we're done with the data */
+ state(conn, IMAP_STOP);
+ return CURLE_OK;
+ }
result = Curl_client_write(conn, CLIENTWRITE_BODY, pp->cache, chunk);
if(result)
return result;
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